Influence of piston material on the fatigue behavior of a glass-ceramic.
J Prosthet Dent
; 129(6): 931-937, 2023 Jun.
Article
de En
| MEDLINE
| ID: mdl-34482967
ABSTRACT
STATEMENT OF PROBLEM:
The lack of standardization regarding the loading piston material used in fatigue tests could limit the interpretation of study findings.PURPOSE:
The purpose of this in vitro study was to evaluate the effect of the piston material on the fatigue behavior of a lithium disilicate glass-ceramic. MATERIAL ANDMETHODS:
Plate-shaped, 1.2-mm-thick, lithium disilicate glass-ceramic specimens were cemented onto a dentin analog substrate with resin cement. The specimens were divided into 4 groups according to the piston material used in the fatigue test (n=30) metal, glass fiber-reinforced epoxy resin, ceramic, and human tooth. The fatigue test was performed in a mechanical cycling machine by using the boundary technique at 2 Hz in distilled water at 37 °C. The fatigue data were analyzed by using the Weibull distribution and a lifetime-inverse power law relationship. Failures were evaluated with fractography and transillumination.RESULTS:
The Weibull modulus (ß) was similar among groups. The exponent of crack growth (n) was significantly greater for glass fiber-reinforced epoxy resin and tooth groups than for metal and ceramic; therefore, the probability of failure (Pf) of glass-ceramic specimens loaded by resin and tooth pistons depended more on load amplitude. Specimens tested with tooth showed the highest value of K (characteristic lifetime), which is an indication of greater survival. Radial crack was the only failure mode observed for all experimental groups.CONCLUSIONS:
The piston material influenced the fatigue survival of the lithium disilicate glass-ceramic. The glass fiber-reinforced epoxy resin piston closely simulated the fatigue behavior induced by the human tooth on the evaluated glass-ceramic.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Implants dentaires
/
Résines époxy
Limites:
Humans
Langue:
En
Journal:
J Prosthet Dent
Année:
2023
Type de document:
Article
Pays d'affiliation:
Brésil